Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
exe:
--- Quote from: kde on October 16, 2017, 08:34:47 pm ---Why two big caps?
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Ah, last time I designed a charge pump the frequency was 50Hz (from mains)... I see, in this case this is not necessary.
hughtmccullough:
Thanks to floobydust, jackenhack and JohnPen for their information on decoupling capacitors.
I notice you did your tests on the voltage measurement. Did you see any improvements on the resistance ranges? For instance, when you short the probes it normally takes several seconds to settle to the nominal value for zero resistance. Does this improve on your meters now that you have upgraded the decoupling?
jackenhack:
--- Quote from: hughtmccullough on October 17, 2017, 11:18:31 am ---Thanks to floobydust, jackenhack and JohnPen for their information on decoupling capacitors.
I notice you did your tests on the voltage measurement. Did you see any improvements on the resistance ranges? For instance, when you short the probes it normally takes several seconds to settle to the nominal value for zero resistance. Does this improve on your meters now that you have upgraded the decoupling?
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I'm almost afraid of saying it, because it could be wishful thinking, but I think the continuity tester is quicker. Could be that I also cleaned the test probes with isopropanol.
Haven't tried the resistance.
Edit
Tested shorting the lead and it takes around 10 seconds to stabilize at 70 milliOhm.
JohnPen:
Unfortunately I didn't check the before settling time for the resistance range. However now a short of the probe leads, the one's supplied with 8008, resulted in a reading of 60 milliohms after 5-6 seconds. It was rather critical on how well one shorted the leads together as the probe plating tends to cause some contact variability affecting the final reading. With regard to the continuity, again not checked before, but it does seem virtually instantaneous now. Sadly my continuity check sound level is one of the quieter ones but it is usable so I will leave that alone.
kde:
--- Quote from: hughtmccullough on October 17, 2017, 11:18:31 am ---Does this improve on your meters now that you have upgraded the decoupling?
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I'd done the same mod and I say no, it does not improve resistance at all for me. The measurement on shorted probes takes 10 - 15 seconds to settle down. Although it may depend on the batteries condition - I put a couple of new duracells in the meter, so they could be good enough with stock decoupling capacitors.
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